Thirty percent of Americans aren't satisfied with their jobs, according to statistics from the Pew Research Center last October. This may not seem like a high percentage, but it adds up to around 95.67 million US adults who aren't doing what they love at least five days a week.

Jody Miller, author and CEO of C2C Executive Search & Strategic Management, has made it her mission to help unhappy employees find careers they love. Her upcoming book, "From Drift to Shift," is a collection of stories that follows individuals as they pursued their own definitions of success, many who left lucrative but dissatisfying jobs behind.

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"I cover a lot of audiences, and that’s what this book came from, I wanted to get deeper into people’s stories," Miller told us Wednesday. "Why people are changing and what’s causing them to make a shift, where is their happiness? That goes across generations, and it’s different for each."

Millennials are the most unhappy at work across all age groups, and only 29 percent report engagement at their jobs.

"The millennial generation is making their own path," Miller explained. "With younger millennials, they have a lot of pressure from their parents or society, but some also feel entitled because everything has been paid for or they haven’t really had to do anything on their own yet. For millennials over 30, they're in the throes of the American dream - they've got to get the right job, the right house, the 1.5 or 2 kids. When they want to make a shift, they’re looking for a full balance while trying to build a family. It's hard, because you can’t bunch millennials into one category."

Miller says that happiness and job satisfaction aren't necessarily related to income, but to how valued an employee feels in the workplace.

"You have to feel you matter," she explained. "There’s a lot of unhappiness in this world, especially at the office. I want people to wake up happy, to be doing the job they've dreamed of doing."

Making a major career change isn't easy, and Miller says it takes complete honesty when asking yourself specific questions.

Are you having fun?

"Some people are bored, and that leads to, 'are you being valued?'" Miller said. Stagnation can destroy the desire to learn or grow in your position.

Are you being challenged?

"If not, it’s probably time to make a change," Miller explained. "Are you doing what you’ve always dreamed of doing? More often that not, I get 'no.' And people follow this expectation, this road map that their parents or society set out for them and it’s not what they’re meant to do."

What did you enjoy doing as a child?

"I try to get people to think of doing things they once loved, then I guide them toward different career tests they can do, like the Myers-Briggs test. I get more into who they are as a person and what they enjoy."

Most important - any drastic career change takes grit and determination, as well as a healthy relationship with failure.

"You need to have courage, you’re never going to be prepared, you have to jump in," Miller advised. "There are going to be ups and downs, you’ve got to have the fortitude to stay the course, and then cut ties if you realize that’s not what you want to do."